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JP2008072206

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DESCRIPTION JP2008072206
The present invention provides a multi-channel audio amplifier that is unlikely to erroneously
operate or set the multi-channel audio amplifier, and is less likely to be misidentified as a
malfunction thereof. A speaker detection circuit for detecting whether a multi-channel audio
amplification device is connected to an arbitrary speaker terminal of speaker terminal groups TA
and TB, an operation circuit and a display circuit connected to a control circuit If the B system
speaker group that does not include surround speakers is connected or not connected, the viewer
U operates / sets the erroneous operation or setting that is likely to occur in each of them. Do not
show. [Selected figure] Figure 1
Multi-channel audio amplifier
[0001]
The present invention relates to a multi-channel audio amplification apparatus for reproducing
multi-channel audio including surround audio, and in particular, includes a speaker terminal
group TA for connecting A system speaker groups including surround speakers reproducing only
surround audio, and a surround speaker The present invention relates to a multi-channel audio
amplification apparatus comprising: a speaker terminal group TB connecting no B system
speaker group.
[0002]
There is provided a multi-channel audio amplification apparatus for reproducing a surround
sound field by reproducing so-called multi-channel audio signals having two or more
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1
independent audio signal channels together with video signals or audio signals alone. .
Various systems and formats have been proposed for multi-channel audio signals, including the
arrangement direction of speakers corresponding to each channel, reproduction frequency band,
surround system, and the like. In many cases, the multi-channel audio signal includes a total of
five channels of signals: front center signal C, surround left signal SL, and surround right signal
SR, together with the front left signal L and the front right signal R , And may include signals of a
total of seven channels of the surround back left signal SBL and the surround back right signal
SBR. In addition to these, there may be a so-called 5.1 channel or 7.1 channel including the bass
signal LFE.
[0003]
Multi-channel audio is scheduled to be reproduced from a speaker group including a plurality of
speakers connected to the multi-channel audio amplifier and arranged corresponding to each
channel. Forward audio signals (forward left signal L, forward right signal R, and forward center
signal C are included. same as below. ) Includes front speakers (front left speaker Lsp, front right
speaker Rsp, and front center speaker Csp) disposed in front of the viewer. same as below. Is
played from). Also, it includes surround sound signals (surround left signal SL, surround right
signal SR, and further, surround back left signal SBL, and surround back right signal SBR. same as
below. ) Includes respective surround speakers (left speaker SLsp, surround right speaker SRsp,
surround back left speaker SBLsp, and surround back right speaker SBRsp) arranged on the side
or rear of the viewer. same as below. It is desirable to play from.
[0004]
However, in the case where the group of speakers reproducing multi-channel audio consists only
of the front speakers arranged in front of the viewer and does not include the surround speakers
reproducing only the surround audio signal, that is, in the minimum case, When only the front
left speaker Lsp and the front right speaker Rsp for general stereo reproduction are provided, the
multi-channel audio amplifier generates a stereo audio signal obtained by mixing the surround
audio signal with the front audio signal, and generates the stereo audio signal as a front speaker
Play from. The processing for generating the stereo audio signal includes downmix processing
(simple phase shift processing or the like) for adding the surround audio signal to the front audio
signal. And the so-called virtual surround processing of adding to the forward audio signal an
audio signal obtained by performing virtual localization processing based on head related
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2
transfer function (HRTF) on the surround audio signal. , Is included. In addition, if a stereo audio
signal obtained by mixing a surround audio signal into a front audio signal is not generated, the
front left speaker Lsp and the front right speaker Rsp have a problem that the surround audio
signal can not be reproduced.
[0005]
Also, conventionally, two speaker groups of A system and B system are connected to one multichannel audio amplification apparatus, and the speaker group of A system and B system is
switched to use either one (so-called "Speaker A or B.) or speakers of A and B simultaneously (socalled "Speaker A + B"). ) May be. These A system speaker group and B system speaker group are
the same or different zones (area such as one room, area to be reproduced. ) Is placed and used.
In the most common usage, for example, the viewer places the A system speaker group in the
first zone, places the B system speaker group in the second zone, and reproduces multi-channel
audio in the first zone If you want to use the multi-channel audio amplification device to output
to the A-system speaker group, if you want to play multi-channel audio in the second zone, you
want to output the multi-channel audio amplification device to It can be operated.
[0006]
However, not all multi-channel audio amplification apparatuses can connect surround speakers
for reproducing only surround sound to each of the two speaker groups of the A system and the
B system. Although speaker terminals for connecting the front speakers and the surround
speakers can be prepared for the speaker terminal group TA for connecting the A system speaker
group, on the other hand, for the speaker terminal group TB for connecting the B system speaker
group, For example, due to the limited panel area for installing the speaker terminals, it may be
possible to prepare only the speaker terminals for connecting the front left speaker Lsp and the
front right speaker Rsp for general stereo reproduction.
[0007]
Conventionally, speaker driving means for self-determining connection or non-connection of
speakers, means for automatically changing the downmixing method from the number of
connected speakers and the method of multi-channel audio to be reproduced, and the connected
speakers There is a speaker connection circuit device provided with a number and an
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3
amplification means for performing downmixing predetermined from a multi-channel audio
system to be reproduced and driving a speaker (Patent Document 1). Also, conventionally, a first
mode in which the A system speaker group and the B system speaker group are disposed in the
first zone, and a A system speaker group is disposed in the first zone, and the B system speaker
group is disposed in the second zone. There is a sound reproducing apparatus having a mode
setting means capable of selecting either one of the second mode to be arranged in (Japanese
Patent Application Laid-Open No. 2000-101501). In addition, in order to detect speakers
connected to the multi-channel audio amplification device and to specify setting conditions for
each channel, a test signal is input to the connected speaker, and test voice by the reproduced
test signal is measured by the microphone. Japanese Patent Laid-Open Publication No. 2003147118 (hereinafter referred to as Patent Document 3) has a setup device for setting the level
and the delay time.
[0008]
Patent Document 1: JP 2003-32800 A (FIG. 1) Patent Document 2: JP 2004-56418 A (FIG. 1) JP
11-243599 A (FIG. 1)
[0009]
In such a conventional multi-channel audio amplification apparatus, when the viewer performs
an operation (for example, an operation to turn "Speaker B" on) when using a B-system speaker
group that does not include a surround speaker, the above-described A process of generating a
stereo audio signal obtained by mixing a surround audio signal with a forward audio signal
(hereinafter referred to as “mixing process”).
Since the surround sound signal component is not reproduced from the B system speaker group
unless the) is performed, the mixing process is performed regardless of the configuration of the
connected A system speaker group. Therefore, when the viewer operates the speaker
configuration of the multi-channel audio amplification apparatus so as to set "Speaker A + B" to
ON, the A system speaker group is arranged even if the A system speaker group includes a
surround speaker. In the second zone, the mixed stereo audio signal is reproduced from the front
speakers, and the surround speakers of the A system speaker group can not be used.
[0010]
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4
In some multi-channel audio amplification apparatuses, some terminals of the speaker terminal
group TA are also used as the speaker terminal group TB in order to reduce the cost in some
cases. In the operation of such a multi-channel audio amplification apparatus, the operation of
“speaker B setting” in the setup menu is required. That is, the "speaker B setting" in which the
viewer distinguishes and sets in advance whether "surround speakers of A system speaker group"
or "front speakers of B system speaker group" are connected to the shared speaker terminal
Provided in the setup menu. For example, if "Speaker B setting: ON", it is assumed that "Speaker
B" is connected to "Surround speaker terminal" and "Surround speaker of A system speaker
group" is not connected, A system and / or B system. The mixing process may be set up
automatically, regardless of the use of the system speaker group.
[0011]
However, a viewer who is not familiar with the operation of the multi-channel audio amplification
apparatus may erroneously operate as "use the B system speaker group", and as a result,
"surround sound is reproduced from the surround speakers of the A system speaker group I will
not. The viewer may misidentify that the operation is defective. In such a case, for example, even
if the A system speaker group includes surround speakers, in the zone where the A system
speaker group is disposed, the stereo audio signal subjected to the mixing process is reproduced
from the front speakers. This is because surround sound is not reproduced from the surround
speakers of the system speaker group. In addition, in the operation of the multi-channel audio
amplification apparatus, only "mixing processing can be selected. It may also lead to the viewer
misidentifying it as "incorrect operation". Also, when “speaker B setting: set to ON” by mistake,
“forward sound is reproduced from a surround speaker (of a system A speaker group connected
to a speaker terminal group TB which is also shared). The viewer may misidentify that the
operation is defective.
[0012]
In other words, due to the restriction that it is impossible to connect the surround speakers, one
of which can reproduce only the surround sound, out of the two speaker groups of the A system
and the B system connected to the multichannel audio amplification apparatus, the viewer If you
operate or set up the channel audio amplifier incorrectly, you must forcibly mix the multichannel
audio signal, and the false recognition that the multichannel audio amplifier is malfunctioning
accordingly will be watched. Problem that can occur in the Further, there is a problem that
setting operation of the multi-channel audio amplification apparatus becomes complicated if the
mode setting means or the like is provided.
09-05-2019
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[0013]
The present invention has been made to solve the above-mentioned problems of the prior art,
and its object is to use one of two speaker groups of A system and B system connected to a multichannel audio amplifier. Even when there is a restriction that surround speakers that only
reproduce surround sound can not be connected, the viewer is unlikely to erroneously operate or
erroneously set the multi-channel audio amplification apparatus, and the operation is defective. It
is an object of the present invention to provide a multi-channel audio amplification apparatus
which is less likely to be misidentified.
[0014]
The multi-channel audio amplifying apparatus according to the present invention connects the
speaker terminal group TA connecting the A system speaker group including the surround
speaker that reproduces only the surround sound among the multi channel audio and the B
system speaker group not including the surround speaker A multi-channel audio amplification
apparatus comprising a speaker terminal group TB, wherein the multi-channel audio signal or
stereo audio signal is output from an audio output circuit that outputs a multi-channel audio
signal or a stereo audio signal obtained by mixing multi-channel audio signals. An amplifier
circuit including a plurality of amplifiers for amplification; a selection output circuit for selecting
and outputting an amplified multi-channel audio signal or stereo audio signal to any speaker
terminal of the speaker terminal groups TA and TB by a switch; A control circuit for controlling a
speaker detection circuit that detects whether a speaker is connected to an arbitrary speaker
terminal of the terminal groups TA and TB, an audio output circuit, an amplification circuit, a
selection output circuit, and a speaker detection circuit And an operation circuit and a display
circuit connected to the control circuit, and the control circuit detects that the speaker detection
circuit does not connect a speaker to any speaker terminal of the speaker terminal group TB, The
audio output circuit and the selective output circuit are controlled so that the output signals from
the multiple amplifiers are not output to any of the speaker terminals of the speaker terminal
group TB, and the operation circuit can not use the B system speaker group Control the display
circuit to indicate that the speaker detection circuit is in the speaker terminal group TB. When
detecting that the speaker in the car terminal is connected, it controls the display circuit to
display the ability to perform an operation for using the B-type speaker group by the operation
circuit.
[0015]
More preferably, in the multi-channel audio amplification apparatus, a first test signal output
circuit for selecting and outputting a noise signal to any speaker terminals of the speaker
terminal groups TA and TB, and a speaker detection circuit; And a microphone amplifier
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6
connected to convert a microphone into an electric signal and outputting a first detection signal,
and any speaker of the speaker terminal groups TA and TB when the first detection signal having
a correlation with the noise signal is detected A first detection circuit that detects that a speaker
is connected to the terminal, a second test signal output circuit that selects and outputs a minute
DC signal to an arbitrary speaker terminal of the speaker terminal group TB, and a DC voltage of
the speaker terminal An offset detection circuit for detecting the second detection signal and
converting the second detection signal into a second detection signal; And a second detection
circuit for detecting that the speaker is connected to any speaker terminals of the speaker
terminal group TB when the detection signal has been detected.
[0016]
Preferably, in the multi-channel audio amplification apparatus, the speaker terminal group TB
connecting the B system speaker group is also used as the surround speaker terminal group
connecting the surround speakers in the A system speaker group among the speaker terminal
groups TA. Is set.
[0017]
Preferably, in the multi-channel audio amplification apparatus, the speaker detection circuit
detects that the speaker is connected to any speaker terminal of the speaker terminal group TB,
and the operation circuit uses only the A system speaker group. Control circuit controls the audio
output circuit to output a multi-channel audio signal, and the selection output circuit outputs
output signals from the plurality of amplifiers only to the speaker terminals of the speaker
terminal group TA. Control.
[0018]
Preferably, in the multi-channel audio amplification apparatus, the speaker detection circuit
detects that a speaker is connected to any speaker terminal of the speaker terminal group TB,
and the operation circuit uses only the B system speaker group. Control circuit controls the audio
output circuit to output a stereo audio signal obtained by mixing multi-channel audio signals, and
outputs the output signals from the plurality of amplifiers to the speaker terminals of the speaker
terminal group TB. Control the selection output circuit to
[0019]
Preferably, in the multi-channel audio amplification apparatus, the speaker detection circuit
detects that a speaker is connected to any speaker terminal of the speaker terminal group TB,
and the A system speaker group and the B system speaker group by the operation circuit. Control
circuit controls the audio output circuit so as to output a stereo audio signal obtained by mixing
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multi-channel audio signals, and the output signals from the plurality of amplifiers are output to
the speaker terminal group. Control the selection output circuit to output to the TA and TB
speaker terminals.
[0020]
Preferably, in the multi-channel audio amplification device, the first detection circuit of the
speaker detection circuit does not detect that the B system speaker group is connected to the
speaker terminal group TB, and the second detection circuit detects B of the speaker terminal
group TB. The control circuit arranges the A system speaker group and the B system speaker
group in different zones when detecting that the system speaker group is connected and the
operation using the B system speaker group is performed by the operation circuit. Control the
audio output circuit to output a stereo audio signal obtained by mixing multi-channel audio
signals, and output the output signals from the plurality of amplifiers to the speaker terminals of
the speaker terminal group TB. Control the selection output circuit.
[0021]
Preferably, in the multi-channel audio amplification apparatus, the first detection circuit of the
speaker detection circuit detects that the B system speaker group is connected to the speaker
terminal group TB, and the second detection circuit performs the B system to the speaker
terminal group TB. The control circuit arranges the A system speaker group and the B system
speaker group in the same zone when detecting that the speaker group is connected and the
operation using the B system speaker group is performed by the operation circuit. Is determined,
the audio output circuit, the amplifier circuit, the selection output circuit, the operation circuit
and the display circuit are controlled, and the first detection circuit detects the speaker terminal
group TA and the microphone. If there is a significant distance difference between the separation
distance Da and the separation distance Db between the speaker terminal group TB detected by
the first detection circuit and the microphone, the control operation is performed. When it is
determined, the audio output circuit is controlled to output a stereo audio signal obtained by
mixing multi-channel audio signals, and output signals from a plurality of amplifiers are output to
the speaker terminals of the speaker terminal group TB. Control the selection output circuit.
[0022]
Hereinafter, the operation of the present invention will be described.
[0023]
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8
The multi-channel audio amplifying apparatus according to the present invention connects the
speaker terminal group TA connecting the A system speaker group including the surround
speaker that reproduces only the surround sound among the multi channel audio and the B
system speaker group not including the surround speaker And a speaker terminal group TB.
Therefore, when using a B-system speaker group which does not include surround speakers, the
control circuit controls the audio output circuit to output a stereo audio signal obtained by
mixing multi-channel audio signals.
The amplifier circuit and the selective output circuit amplify the stereo audio signal, and select
and output the output signal from the amplifier to the speaker terminal of the speaker terminal
group TB by a switch.
The same applies to the case where the speaker terminal group TB is also used as a surround
speaker terminal group for connecting surround speakers in the A system speaker group among
the speaker terminal groups TA.
[0024]
Here, the multi-channel audio amplification apparatus of the present invention includes a speaker
detection circuit that detects whether a speaker is connected to any speaker terminal of the
speaker terminal groups TA and TB.
Specifically, the speaker detection circuit includes a first detection circuit and a second detection
circuit.
The first detection circuit selects and outputs a noise signal to an arbitrary speaker terminal of
the speaker terminal groups TA and TB, connects a microphone for converting a sound wave of
an installed zone into an electric signal, and a speaker It detects that it is connected.
Further, the second detection circuit selects and outputs a minute DC signal to an arbitrary
speaker terminal of the speaker terminal group TB, detects a DC voltage of the speaker terminal,
and detects that a speaker is connected to the speaker terminal. To detect.
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Therefore, the multi-channel audio amplification apparatus can reliably detect whether a speaker
is connected to any of the speaker terminals of the speaker terminal group TB, and further, the A
system speaker group and the B system speaker group are It can also be determined whether
they are located in the same or different zones.
[0025]
That is, since the multi-channel audio amplification apparatus of the present invention includes
the operation circuit and the display circuit connected to the control circuit, when the B system
speaker group not including the surround speaker is connected or not connected In this case, it is
possible to display an erroneous operation or an erroneous setting that is likely to occur in each
case, so that the viewer does not operate / set with the operation circuit.
When the speaker detection circuit detects that a speaker is not connected to any of the speaker
terminals of the speaker terminal group TB, the operation circuit displays that the operation
using the B system speaker group is not possible. When controlling the display circuit and the
speaker detection circuit detects that the speaker is connected to any speaker terminal of the
speaker terminal group TB, the operation circuit can use the B system speaker group. Control the
display circuit to display
[0026]
Further, when the control circuit detects that the speaker detection circuit does not connect a
speaker to any one of the speaker terminals of the speaker terminal group TB, the control circuit
outputs the output signals from the plurality of amplifiers to any one of the speaker terminal
group TB. The audio output circuit and the selective output circuit are controlled not to output to
the speaker terminal.
Furthermore, when the speaker detection circuit detects that a speaker is connected to any
speaker terminal of the speaker terminal group TB, only the A system speaker group, only the B
system speaker group, or the A system is used. The control circuit controls the audio output
circuit, the amplifier circuit, and the selection output circuit in accordance with the operation of
simultaneously using the B-system speaker group by the operation circuit.
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[0027]
For example, when the speaker detection circuit detects that a speaker is connected to any of the
speaker terminals of the speaker terminal group TB, and the operation circuit uses only the B
system speaker group, the control circuit Controls the audio output circuit to output a stereo
audio signal obtained by mixing multi-channel audio signals, and controls the selection output
circuit to output output signals from a plurality of amplifiers to the speaker terminals of the
speaker terminal group TB Do.
That is, as long as a speaker is connected to any speaker terminal of the speaker terminal group
TB, it is possible to select the "use system B speaker group" operation or "Speaker B setting" from
the setup menu, resulting in the speaker From the B-system speaker connected to the terminal
group TB, stereo audio obtained by mixing multi-channel audio can be reproduced.
[0028]
Further, in the multi-channel audio amplification apparatus of the present invention, the A
system speaker group and the B system speaker group are arranged in the same or different
zones from the configuration of the speaker detection circuit including the first detection circuit
and the second detection circuit. If the system A speaker group and the system B speaker group
are disposed in the same zone, the first detection circuit determines the separation distance Da
between the speaker terminal group TA and the microphone, and the speaker terminal group TB.
And the separation distance Db between the microphone and the microphone can also be
determined.
[0029]
For example, the first detection circuit does not detect that the B system speaker group is
connected to the speaker terminal group TB, and the second detection circuit detects that the B
system speaker group is connected to the speaker terminal group TB. In this case, there is a high
possibility that the microphone connected to the first detection circuit and the B system speaker
group are disposed in different zones.
Therefore, in the case where “A system speaker group is arranged in the first zone and B system
09-05-2019
11
speaker group is arranged in the second zone” assumed as the case of the most common usage,
multi-channel audio The control circuit of the amplification device can be determined. As a result,
the first mode in which the A system speaker group and the B system speaker group are
arranged in the first zone as in the prior art, and the A system speaker group is arranged in the
first zone and the B system speaker group is There is no need to newly provide mode setting
means capable of selecting either one of the second mode arranged in zone 2 and the setting
operation of the multi-channel audio amplification apparatus can be simplified.
[0030]
In the multi-channel audio amplification apparatus of the present invention, there is a restriction
that one of the two speaker groups of A system and B system connected to the multi-channel
audio amplification apparatus can not connect the surround speakers for reproducing only the
surround sound. Even so, a multi-channel audio amplification apparatus is realized that is easy
for the viewer to operate, is less likely to be erroneously operated or erroneously set, and is less
likely to be misidentified as a malfunction thereof.
[0031]
In the multi-channel audio amplification apparatus of the present invention, there is a restriction
that one of the two speaker groups of A system and B system connected to the multi-channel
audio amplification apparatus can not connect the surround speakers for reproducing only the
surround sound. Even in this case, the multi-channel audio amplification apparatus is intended to
make it difficult for the viewer to erroneously operate or set the multi-channel audio
amplification apparatus and to prevent the false recognition that the malfunction is caused. , A
speaker detection circuit that detects whether a speaker is connected to any speaker terminal of
speaker terminal groups TA and TB, an operation circuit and a display circuit connected to the
control circuit, and a B system speaker not including a surround speaker If the group is
connected or The setting case, the resulting easy wrong operation or incorrect respectively have,
by configured to display as the viewer does not operate and set the operating circuit, is realized.
[0032]
Hereinafter, a multi-channel audio amplification apparatus according to preferred embodiments
of the present invention will be described, but the present invention is not limited to these
embodiments.
[0033]
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12
FIG. 1 is a diagram for explaining a multi-channel audio amplification apparatus 1 according to a
preferred embodiment of the present invention.
The multi-channel audio amplification apparatus 1 decodes multi-channel audio data input to the
terminal adata from another DVD player (not shown) (not shown), amplifies it for each channel,
and connects it to the speaker terminal group TA (shown in FIG. Not output) to a plurality of
speakers to reproduce multi-channel audio to the viewer U
The multi-channel audio amplification apparatus 1 has a speaker terminal group TA for
connecting A-system speaker groups including surround speakers that reproduce only surround
sound among multi-channel audio, and a speaker terminal for connecting B-system speaker
groups not including surround speakers. The speaker terminal group TB is shared by a part of
the speaker terminal group TA.
Therefore, the multi-channel audio amplification apparatus 1 may perform mixing processing of
the multi-channel audio signal corresponding to the speaker connected to the speaker terminal.
[0034]
In the present embodiment, in the multi-channel audio amplification device 1, a decoding circuit
11 configured inside a DSP (Digital Signal Processor) 10 decodes multi-channel audio data into
7.1-channel surround audio data. The 7.1-channel audio data includes all bands of front left data
L, front right data R, front center data C, surround left data SL, surround right data SR, surround
back left data SBL, and surround back right data SBR. A total of seven channels including
components and band-limited bass data LFE. The 7.1 channel audio data is output to a DAC
(Digital Analog Converter) 2 through a mixing processing circuit 12 configured inside the DSP 10
and converted into a 7.1 channel analog audio signal. Of the 7.1 channel analog audio signals, a
total of 7 channels including the components of the entire band are amplified by the amplifier 3
for amplifying each channel audio, and via the selection circuit 4 composed of a plurality of
switch relays, It is output to the speaker terminal group TA. Also, the band-limited bass signal
LFE is output from the terminal lfe and input to the amplifier built-in subwoofer Sub (not shown).
[0035]
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13
In addition, the multi-channel audio amplification device 1 has a CPU (central processing unit) 5
for controlling the whole, an operation circuit 6 including a switch, a display circuit 7 including a
liquid crystal display panel and an LED, and a speaker connecting a microphone. An identification
circuit 8 and a connection detection circuit 9 for detecting that a speaker is connected to the
speaker terminal of the speaker terminal group TB are included, and other circuit configurations
such as a power supply are omitted in FIG. The operation circuit 6 and the display circuit 7 of the
multi-channel audio amplification device 1 operate the operation of “set speaker B” in the
setup menu, or the operation of switching between the A system speaker group and the B system
speaker group (“Speaker A or B (including the operation of turning ON / OFF only “Speaker
A” and “Speaker B” respectively) and the operation of selecting “Speaker A + B”), and the
first zone / second zone Enables setting / operation to make it possible to switch. A speaker
detection circuit for detecting whether or not a speaker is connected to the speaker terminal
groups TA and TB includes a CPU 5, a DSP 10, a speaker identification circuit 8, and a connection
detection circuit 9.
[0036]
The plurality of speakers for multi-channel reproduction have different acoustic conditions (delay
time difference due to difference in separation distance, reproduction level difference) at the
viewing position of the viewer U due to the respective installation conditions. The CPU 5 of the
multi-channel audio amplification device 1 measures the acoustic conditions of the plurality of
speakers at the viewing position of the viewer U using the connected microphone, reflects the
measurement results, and aligns these delay times and Perform automatic sound field correction
to adjust the playback level. A first test signal output circuit 13 configured inside the DSP 10
selects and outputs a test noise signal to each channel by a switch. The test noise signal is
amplified by the amplifier 3 and supplied to the individual speakers for reproduction through the
selection circuit 4 and the speaker terminals of the speaker terminal groups TA and TB.
[0037]
The speaker identification circuit 8 includes a microphone amplifier 81 and a first detection
circuit 82. The microphone amplifier 81 connects a microphone that converts sound waves in the
installed zone into an electric signal, and outputs a first detection signal. The first detection
circuit 82 detects that the speaker is connected when the first detection signal having a
correlation with the test noise signal is detected. The CPU 5 uses the speaker identification circuit
8 to measure, for each of the speakers connected to the speaker terminal groups TA and TB, the
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delay time due to the distance from the microphone and the reproduction level. In addition, when
the first detection signal is not detected, it is detected that the speaker is not connected to the
speaker terminal that has supplied the test noise signal.
[0038]
On the other hand, the connection detection circuit 9 constituting the speaker detection circuit
detects whether a speaker is connected to the speaker terminal group TB. When the second test
signal output circuit 91 of the connection detection circuit 9 turns on the switch relay 92 while
the switch relay of the selection circuit 4 is turned off, the pull-up resistor 93 is connected to the
speaker terminals of the speaker terminal group TB. A minute DC voltage is applied via If a
speaker is connected, a minute DC current is detected at the speaker terminal of the speaker
terminal group TB. Therefore, the second detection circuit 94 including the offset detection
circuit has a second detection signal having a correlation with the minute DC signal. When it is
detected, it is detected that the speaker is connected to the speaker terminal group TB, and if the
second detection signal having a correlation with the minute DC signal is not detected, the
speaker is connected to the speaker terminal group TB. Detect that it is not connected.
[0039]
That is, the CPU 5 that controls the multi-channel audio amplification device 1 detects the
presence or absence of the speakers connected to the speaker terminal groups TA and TB and
the presence or absence of the speakers connected to the speaker terminal group TB. Therefore,
the CPU 5 operates such that the viewer U does not erroneously operate or erroneously set the
multi-channel audio amplification apparatus 1 based on the detected result. Details of the
operation will be described later.
[0040]
In the present embodiment, the speaker terminal group TA of the multi-channel audio amplifying
device 1 is a speaker terminal group for connecting a total of seven channels of speakers, that is,
a terminal 1 for connecting the front left speaker Lsp and the front center speaker Csp A
terminal c for connecting, a terminal r for connecting the front right speaker Rsp, a terminal sl
for connecting the surround left speaker SLsp, a terminal sr for connecting the surround right
speaker SRsp, and a terminal sbl for connecting the surround back left speaker SBLsp It is
09-05-2019
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comprised from the terminal sbr which connects a surround back right speaker SBRsp.
Therefore, a maximum of seven speakers of the A system speaker group can be connected to the
speaker terminals of all seven channels of the speaker terminal group TA.
[0041]
Further, the terminals sbl and the terminals sbr, which are a part of the speaker terminal group
TA, are shared as a speaker terminal group TB that connects B system speaker groups (front left
speaker LspB and front right speaker RspB) not including surround speakers. The respective
terminals are denoted as terminals sbl / bl and terminals sbr / br. The viewer U operates the
“speaker B setting” of the multi-channel audio amplifying device 1 of this embodiment to ON
(effective), and further operates the switch of the operation circuit 6 to “Speaker B”: ON to
perform B system. When the speaker group is to be used, the B system front left speaker LspB is
connected to the terminal sbl / bl, and the B system front right speaker RspB is connected to the
terminal sbr / br. In this case, the terminals sbl / bl and sbr / br output stereo audio signals
obtained by mixing multi-channel audio signals.
[0042]
As described above, the multi-channel audio amplification device 1 of the present embodiment
also includes the A-system speaker by the configuration of the A-system speaker group
connected to the speaker terminal group TA and the B-system speaker group connected to the
speaker terminal group TB. When the group and the B system speaker group are disposed in the
same or different zones and used, various usage situations are possible. FIGS. 2-5 is a figure
explaining the typical usage condition of the multichannel audio | voice amplifier 1. FIG. 2 (a) to
2 (a) are diagrams for explaining the reproduction zone and the arrangement of the speakers,
and FIGS. 2 (b) to 2 (b) show the state of the multichannel audio amplification apparatus 1 and
the speaker group. It is a figure explaining connection of. In addition, in FIGS. 2-5, the description
about a part of structure of the multi-channel audio | voice amplifier 1 shown in FIG. 1, and the
connection line to each speaker is abbreviate | omitted. Also, a microphone connected to the Mic
terminal of the speaker identification circuit 8 is disposed in the zone 1 to measure multi-channel
audio and test noise provided to the viewer U.
[0043]
09-05-2019
16
FIG. 2 shows a case where the A channel speaker group of 5.1 channel configuration is
connected to the multi-channel audio amplifier 1 and arranged in the zone 1, while the B channel
speaker group is not connected to the multi-channel audio amplifier 1 is there. In zone 1, the
front left speaker Lsp of the A system speaker group, the front right speaker Rsp, the front center
speaker Csp, the surround left speaker SLsp, the surround right speaker SRsp, and the subwoofer
Sub are disposed. Terminal l of the speaker terminal group TA is the front left speaker Lsp,
terminal r is the front right speaker Rsp, terminal c is the front center speaker Csp, terminal sl is
the surround left speaker SLsp, and terminal sr is the terminal sr Is connected to the surround
right speaker SRsp. On the other hand, neither the speakers of the A system speaker group nor
the speakers of the B system speaker group are connected to the terminals sbl / bl and the
terminals sbr / br. In this case, it is a normal operation that the viewer U operates the switch of
the operation circuit 6 to “Speaker A”: ON to use only the A system speaker group.
[0044]
In the case of FIG. 2, when “Speaker A”: ON is operated by the operation circuit 6, the DSP 10
sends the surround back left data SBL and the surround back right data SBR output from the
decode circuit 11 to the mixing processing circuit 12. After predetermined coefficients are
multiplied by the provided multipliers and level adjustment is performed respectively, they are
respectively added by the adder to the surround left data SL and the surround right data SR. In
the case of FIG. 2, the coefficients k01 to k13 are appropriately set to appropriate correlation
values except that the coefficient k14 is 0 (zero). Further, the switches SW11 to SW14 provided
in the mixing processing circuit 12 are all turned off, and the output signal is output to the
terminal sbl / bl and the terminal sbr / br that double as the speaker terminal group TB
connecting the B system speaker group. I will not.
[0045]
FIG. 3 shows that a 5.1 channel A group speaker group is connected to multi-channel audio
amplifier 1 and arranged in zone 1, while a B group speaker group is connected to multi channel
audio amplifier 1 It is a case where it arranges to 2. In zone 1, the front left speaker Lsp of the A
system speaker group, the front right speaker Rsp, the front center speaker Csp, the surround
left speaker SLsp, the surround right speaker SRsp, and the subwoofer Sub are disposed. In zone
2, the front left speaker LspB of the B system speaker group and the front right speaker RspB are
arranged. Terminal l of the speaker terminal group TA is the front left speaker Lsp, terminal r is
the front right speaker Rsp, terminal c is the front center speaker Csp, terminal sl is the surround
left speaker SLsp, and terminal sr is the terminal sr Is connected to the surround right speaker
09-05-2019
17
SRsp. On the other hand, the front left speaker LspB of the B system speaker group is connected
to the terminal sbl / bl, and the front right speaker RspB of the B system speaker group is
connected to the terminal sbr / br. In this case, the viewer U operates the switch of the operation
circuit 6 to “Speaker A”: ON to use the A system speaker group, and / or “Speaker B”:
operates to B system speaker group It is normal operation to use. That is, “Speaker A or B” and
“Speaker A + B” can be operated.
[0046]
In the case of FIG. 3, when “Speaker B”: ON only or “Speaker A + B” is operated by the
operation circuit 6, the DSP 10 outputs the front center data C, the surround left data SL and the
front left data output from the decode circuit 11. The surround back left data SBL is multiplied by
a predetermined coefficient by a multiplier provided in the mixing processing circuit 12 and
level-adjusted, and then added to the front left data L by an adder. In addition, the front center
data C, the surround right data SR and the surround back right data SBR are multiplied by
predetermined coefficients by a multiplier provided in the mixing processing circuit 12 and leveladjusted respectively, and then the front right data R is added by an adder. to add. In the case of
FIG. 3, the coefficients k01 to k11 are appropriately set to appropriate correlation values except
that the coefficients k12, k13 and k14 are 0 (zero). Further, the switches SW11 and SW13
provided in the mixing processing circuit 12 are turned on, and the switches SW12 and SW14
are turned off. Therefore, in the terminal group TA connecting the A system speaker group, a
stereo obtained by mixing processing of multi-channel audio signals to the terminal l and the
terminal r and the terminals sbl / bl and the terminal sbr / br connecting the B system speaker
group. An audio signal is output. On the other hand, no output signal is output to the terminal c,
the terminal sl and the terminal sr.
[0047]
FIG. 4 shows the case where the A channel speaker group of 7.1 channel configuration is
connected to the multi-channel audio amplifier 1 and arranged in the zone 1, while the B channel
speaker group is not connected to the multi-channel audio amplifier 1 is there. Zone 1 includes
front left speaker Lsp, front right speaker Rsp, front center speaker Csp, surround left speaker
SLsp, surround right speaker SRsp, surround back left speaker SBLsp, and surround back right. A
speaker SBRsp and a subwoofer Sub are arranged. Terminal l of the speaker terminal group TA is
the front left speaker Lsp, terminal r is the front right speaker Rsp, terminal c is the front center
speaker Csp, terminal sl is the surround left speaker SLsp, and terminal sr is the surround The
right speaker SRsp is connected to the terminal sbl / bl, and the surround back left speaker
09-05-2019
18
SBLsp of the A system speaker group is connected to the terminal sbr / br, and the surround
back right speaker SBRsp is connected to the terminal sbr / br. In this case, it is a normal
operation that the viewer U operates the switch of the operation circuit 6 to “Speaker A”: ON
to use the A system speaker group. However, since terminals sbl / bl and sbr / br are connected
with speakers that can be substituted for the B system speaker group, it is preferable that an
operation of “Speaker B”: ON is also possible.
[0048]
In the case of FIG. 4, when “Speaker A”: ON is operated by the operation circuit 6, the DSP 10
outputs the front left data L, front center data C, front right data R, and surround left data output
from the decoding circuit 11. The SL, the surround back left data SBL, and the surround back
right data SBR are multiplied by predetermined coefficients by a multiplier provided in the
mixing processing circuit 12 and adjusted in level, respectively, and then output as they are
without mixing processing. In the case of FIG. 4, the coefficients k01 to k04 and k11 to k14 are
appropriately set to appropriate correlation values. Further, the switches SW11 and SW13
provided in the mixing processing circuit 12 are turned off, and the switches SW12 and SW14
are turned on. Therefore, among terminals TA connecting the A system speaker group, terminals
sbl / bl and terminals sbr / br that are also used to connect the B system speaker group are the
surround back left signal and the surround back right signal. Is output, and a stereo audio signal
obtained by mixing multi-channel audio signals is not output.
[0049]
In FIG. 5, the A channel speaker group of 5.1 channel configuration is connected to the multichannel audio amplifier 1 and arranged in the zone 1, while the B channel speaker group is
connected to the multi-channel audio amplifier 1; This is also a case where it is arranged in zone
1. In zone 1, the front left speaker Lsp of the A system speaker group, the front right speaker
Rsp, the front center speaker Csp, the surround left speaker SLsp, the surround right speaker
SRsp, and the subwoofer Sub are arranged, and the zone The front left speaker LspB and the
front right speaker RspB of the B system speaker group are arranged apart from where the A
system speaker group 1 is arranged. Terminal l of the speaker terminal group TA is the front left
speaker Lsp, terminal r is the front right speaker Rsp, terminal c is the front center speaker Csp,
terminal sl is the surround left speaker SLsp, and terminal sr is the terminal sr Is connected to
the surround right speaker SRsp. On the other hand, the front left speaker LspB of the B system
speaker group is connected to the terminal sbl / bl, and the front right speaker RspB of the B
system speaker group is connected to the terminal sbr / br. In this case, the viewer U operates
09-05-2019
19
the switch of the operation circuit 6 to “Speaker A”: ON to use the A system speaker group,
and / or “Speaker B”: operates to B system speaker group It is normal operation to use. That is,
“Speaker A or B” and “Speaker A + B” can be operated.
[0050]
In the case of FIG. 5, when “Speaker B”: ON only or “Speaker A + B” is operated by the
operation circuit 6, the DSP 10 performs the same mixing process as in the case of FIG.
Therefore, in the terminal group TA connecting the A system speaker group, a stereo obtained by
mixing processing of multi-channel audio signals to the terminal l and the terminal r and the
terminals sbl / bl and the terminal sbr / br connecting the B system speaker group. An audio
signal is output. On the other hand, no output signal is output to the terminal c, the terminal sl
and the terminal sr.
[0051]
FIG. 6 shows the presence or absence of the speakers connected to the speaker terminal groups
TA and TB according to the use conditions represented by FIGS. 2 to 5 by the CPU 5 for
controlling the multi-channel audio amplification device 1 of this embodiment. It is a flowchart
explaining the operation | movement which detects each automatically the presence or absence
of the speaker connected to the speaker terminal group TB. This automatic detection starts the
operation when the viewer U operates the operation circuit 6 of the multi-channel audio
amplification device 1 to operate the speaker identification circuit 8 to perform speaker
identification (S101).
[0052]
The CPU 5 operates the first test signal output circuit 13 configured inside the DSP 10 to output
a test noise signal, and the speaker identification circuit 8 to which the microphone is connected
allows the speaker terminal group TA (and the speaker terminal group TB to be shared). Whether
or not a speaker is connected to each of the terminal l, the terminal r, the terminal c, the terminal
sl, the terminal sr, and the terminals sbl / bl and sbr / br) (S102, S103) . As described above,
when the first detection signal having a correlation with the test noise signal is not detected, the
CPU 5 determines that the speaker is not connected. In addition, when the speaker identification
circuit 8 detects that a speaker is connected, the delay time due to the distance from the
09-05-2019
20
microphone and the reproduction level are measured for each of the connected speakers.
[0053]
Next, the CPU 5 determines whether a speaker is connected to any one of the speaker terminals
of the speaker terminal group TB, that is, the speaker terminals sbl / bl and the terminals sbr / br
(S104). When the speaker identification circuit 8 to which the microphone is connected
determines that the speaker is not connected to the speaker terminal group TB (S104: No), for
example, as in FIG. 2, the speaker terminal sbl / bl and the terminal sbr The speakers are
connected to the speaker terminals sbl / bl and the terminals sbr / br as well as in the case where
the speakers are not actually connected to the / br and FIG. The microphone connected to the
identification circuit 8 is disposed in the first zone, while the B system speaker group is disposed
in the second zone acoustically separated from the first zone, and the speaker identification
circuit 8 is in the B system. There are cases where the connection of the speaker group can not
be detected. Therefore, the CPU 5 operates the connection detection circuit 9 for outputting a
minute DC voltage to detect whether or not a speaker is connected to the speaker terminal group
TB (S105).
[0054]
If the speaker is not connected to the speaker terminal group TB based on the detection result of
the connection detection circuit 9 (S106: No), the CPU 5 performs the operation of “Speaker B
setting” in the setup menu or the B system speaker group. Operations to be used ("Speaker B":
an operation to turn on and an operation to select "Speaker A or B" / "Speaker A + B", an
operation to switch the first zone / the second zone) . ) Is invalidated (S107). Therefore, in the
case of the use situation of FIG. 2, for example, even if it is going to select the B system speaker
group which is not connected, "Speaker B" is not set up erroneously, "operation failure of
multichannel audio amplification apparatus 1" Can be prevented. Further, in this case, the CPU 5
controls the DSP 10 and the selection output circuit 4 so as not to output an output signal to any
of the speaker terminals of the speaker terminal group TB.
[0055]
Further, from the detection result of the connection detection circuit 9, when the speakers are
connected to the speaker terminal group TB (S106: Yes), the CPU 5 arranges the A system
09-05-2019
21
speaker group and the B system speaker group in different zones. Operation, “Speaker B
setting” operation in the setup menu, or operation using the B system speaker group (“Speaker
B”: operation to turn on, and “Speaker A or B” / ”Speaker A + B Operation to select “1.” or
operation to make it possible to switch the first zone / the second zone (S108). Specifically, in the
case of the use state of FIG. 3, the viewer U switches one of the A system speaker group disposed
in the first zone and the B system speaker group disposed in the second zone. It can be used
(“Speaker A or B”) or simultaneously used by the first viewer U in the first zone and the second
viewer U in the second zone (“Speaker A + B”). In the case of “Speaker B”: ON and “Speaker
A + B”, the multi-channel audio amplification device 1 outputs a stereo audio signal obtained by
mixing the multi-channel audio signal, and the stereo audio is in the second zone. Thus, it is
possible to prevent the audio contained in the channels other than the front left data L and the
front right data R from being lost and reproduced. Of course, in the case of "Speaker A": ON only,
it is possible to reproduce the 5.1 channel surround sound field using all A system speakers
arranged in the first zone.
[0056]
When the speaker identification circuit 8 to which a microphone is connected determines that a
speaker is connected to any speaker terminal of the speaker terminal group TB, that is, to the
speaker terminals sbl / bl and the terminals sbr / br ( S104: Yes, the CPU 5 determines that the A
system speaker group and the B system speaker group are arranged in the same zone, and the
measured delay time of the A system speaker group and the measured B system Using the delay
time of the speaker group, the separation distance Da between the A system speaker group and
the microphone to be measured is compared with the separation distance Db between the B
system speaker group and the microphone to be measured (S109). Specifically, the separation
distance Da between the speaker and the microphone connected to the terminal l of the speaker
terminal group TA and the separation distance Db between the speaker and the microphone
connected between the terminals sbl / bl of the speaker terminal group TB are compared. If the
value of the ratio of Db to Da is less than a predetermined value, for example, as in the case of
FIG. 4, the A system speaker group connected to the speaker terminal group TA and the speaker
group connected to the speaker terminal group TB are It is determined that they are arranged in
the same zone and are closely arranged (S109: Near). Therefore, the speakers connected to the
speaker terminals sbl / bl and the terminals sbr / br are the surround back left speaker SBLsp
and the surround back right speaker SBRsp, or the front left speaker LspB and the front right
speaker of the B system speaker group The operation of "Speaker B setting" in the setup menu or
the operation using the B system speaker group ("Speaker B: ON operation, and" Speaker A or B
"/" Speaker A + B "assuming that it is RspB Operation to select ) Is made effective, while the
operation to make the first zone / the second zone switchable is invalidated (S110).
09-05-2019
22
[0057]
On the other hand, when the CPU 5 compares the separation distance Da between the A system
speaker group and the microphone to be measured and the separation distance Db between the B
system speaker group and the microphone to be measured (S109), the ratio of Db to Da Of the A
system speaker group connected to the speaker terminal group TA and the speaker group
connected to the speaker terminal group TB are far apart even if they are arranged in the same
zone. It is determined that (S109: Far). In this case, since the conditions are substantially the
same as when the A system speaker group and the B system speaker group are arranged in
different zones, the operation of “Speaker B setting” in the setup menu or the B system
speaker group is used. Operation ("Speaker B": operation to turn on and operation to select
"Speaker A or B" / "Speaker A + B") or to make the first zone / the second zone switchable The
operation is validated (S108).
[0058]
As described above, the CPU 5 detects the speakers connected to the speaker terminal groups TA
and TB, thereby using the operation of “Speaker B setting” in the setup menu corresponding to
the connection of the speakers or using the B system speaker group. Operations (including the
operation to turn on "Speaker B" and the operation to select "Speaker A or B" / "Speaker A + B"),
and the operation to make the first zone / the second zone switchable Is made valid or invalid,
and the operation of automatic detection is ended (S110).
[0059]
FIG. 7 shows that during the normal operation of the multi-channel audio amplifying device 1 of
the present embodiment, that is, the presence or absence of the speakers with which the CPU 5
of the multi-channel audio amplifying device 1 is already connected to the speaker terminal
groups TA and TB, and the speaker terminals In the normal operation in which the operation of
automatically detecting the presence or absence of the speaker connected to the group TB is
finished, for example, the viewer U operates the operation circuit 6 of the multi-channel audio
amplification device 1 "Speaker B": a flowchart illustrating the operation of the CPU 5 when the
operation to turn on is performed (S201: Yes).
[0060]
From the result of automatic detection of the speaker connection, if the operation using the B
09-05-2019
23
system speaker group is invalidated (S202: No), the B system speaker group is connected to the
speaker terminal sbl / bl and the terminal sbr / br. Since there is not, the CPU 5 causes the
display circuit 7 to display an error "" Speaker B is not Connected!
(B system speaker group is not connected.
Is displayed (S203). Specifically, in the case of the use state of FIG. 2, “Speaker B”: even if the
viewer U operates to turn on, the multi-channel audio amplification device 1 does not accept the
operation, and The message "Speaker B: Invalid setting" is displayed to indicate to the viewer U
that the operation using the B system speaker group is impossible.
[0061]
On the other hand, if the operation of using the B system speaker group is enabled from the
result of the automatic detection of the speaker connection (S202: Yes), the B system speaker
group is connected to the speaker terminal sbl / bl and the terminal sbr / br. Since it is
connected, the CPU 5 permits the operation of using the B system speaker group (S204).
Specifically, for example, in the use condition of FIG. 3, the mixing processing circuit 12 of the
DSP 10 outputs a stereo sound signal obtained by mixing multi-channel sound signals, and the B
system speaker group disposed in the second zone Can be played from the front left speaker
LspB and the front right speaker RspB.
[0062]
As described above, when operating the multi-channel audio amplification device 1 of the present
embodiment, the viewer U selects one of the two speaker groups of the A system and the B
system connected to the multi-channel audio amplification device 1. Even when there is a
restriction that the system can not connect a surround speaker that reproduces only surround
sound, no erroneous operation or erroneous setting is made, and false recognition that the
operation is defective is less likely to occur.
[0063]
The mixing process performed by the mixing process circuit 12 of the DSP 10 is not limited to
the case shown in FIGS. 2 to 5 of this embodiment.
09-05-2019
24
The downmix method of reproducing multi-channel audio output from the decoding circuit 11 of
the DSP 10 into a stereo audio signal is performed by using a filter circuit configured inside the
DSP 10 to convert head sound transfer functions HRTF (Head Related Transfer) to surround
audio signals. Virtual surround processing that performs virtual localization processing based on
Function) and adds these to the forward sound signal. Also, the bass signal LFE may be added.
[0064]
Further, when the multi-channel audio output from the decoding circuit 11 of the DSP 10 is a socalled 5.1 channel, the multi-channel audio amplifying device 1 connects speakers for a total of 6
channels in the speaker terminal group TA. The speaker terminal group TB may share part of the
speaker terminal group TA as in the above embodiment, and provided as a speaker terminal
group separate from the speaker terminal group TA. May be
[0065]
Furthermore, although the selection circuit 4 of the multi-channel audio amplification device 1 of
the present embodiment is composed of a plurality of switch relays, the output of the
amplification circuit 3 corresponding to each speaker terminal is turned on / off. It is not limited
to the case.
The output of one amplifier circuit 3 may be connected in parallel to a plurality of speaker
terminals. The output of a predetermined amplifier may be output to any speaker terminal
according to the configuration of multi-channel audio output from the decoding circuit 11 of the
DSP 10 and the mixing processing performed by the mixing processing circuit 12.
[0066]
The multi-channel audio amplification apparatus of the present invention is not limited to the
above embodiment, and is an AV receiver for transmitting a multi-channel audio signal format
such as MPEG-2 / AAC, or a multi-channel audio signal reproduction apparatus such as a disc
reproduction apparatus. It is also suitable for one including an amplifier that connects two
speaker groups of a system and a B system.
[0067]
09-05-2019
25
It is a figure explaining the multi-channel audio | voice amplifier by preferable embodiment of
this invention.
(Example 1) It is a figure explaining the typical usage condition of the multi-channel audio | voice
amplifier by preferable embodiment of this invention. (Example 1) It is a figure explaining the
typical usage condition of the multi-channel audio | voice amplifier by preferable embodiment of
this invention. (Example 1) It is a figure explaining the typical usage condition of the multichannel audio | voice amplifier by preferable embodiment of this invention. (Example 1) It is a
figure explaining the typical usage condition of the multi-channel audio | voice amplifier by
preferable embodiment of this invention. (EXAMPLE 1) The CPU of the multi-channel audio
amplification apparatus of this example is a flow chart for explaining an operation of
automatically detecting the presence or absence of a speaker connected to the speaker terminal
groups TA and TB. (Example 1) It is a flow chart for explaining the operation of the CPU during
the normal operation of the multi-channel audio amplification apparatus of this example.
Example 1
Explanation of sign
[0068]
DESCRIPTION OF SYMBOLS 1 multi-channel audio amplifier 2 DA converter 3 amplifier 4
selection circuit 5 CPU (central processing unit) 6 operation circuit 7 display circuit 8 speaker
identification circuit 9 connection detection circuit 10 DSP 11 decoding circuit 12 mixing
processing circuit 13 first test signal Output circuit TA A system speaker terminal group TB B
system speaker terminal group
09-05-2019
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